Double hook



FIG. 1 is a front view of a double hook embodying my new design;

FIG. 2 is a rear view of the double hook shown in FIG. 1;

FIG. 3 is left-hand view of the double hook shown in FIG. 1, a mirror image of the right-hand view thereof;

FIG. 4 is a top view of the double hook shown in FIG. 1; and,

FIG. 5 is a bottom view of the double hook shown in FIG. 1. 

The ornamental design for a double hook, as shown and described. 